On Thu, Mar 12, 2009 at 10:37 AM, Seth Vidal <skvidal@xxxxxxxxxxxxxxxxx> wrote: > On Thu, 12 Mar 2009, David L wrote: >> On Tue, Mar 10, 2009 at 8:38 AM, Patrick O'Callaghan wrote: >>> >>> On Tue, 2009-03-10 at 11:01 +0000, Frank Murphy (Frankly3D) wrote: >> >> <snip> >>>> >>>> Then would it be time for some sort of "rollback" utility, >>>> so if "yum update something" breaks, maybe : yum --rollback something >>> >>> That's been discussed before. It's fantastically hard to do, short of >>> snapshotting the whole system. >>> >>> >> >> I saw this article that seems relevant to this discussion >> a few months back: >> >> http://www.linux.com/feature/155922 >> >> It talks about a "next generation" package manager called >> Nix that claims to solve this kind of problem I think: >> >> http://nixos.org/ >> >> Whether nix is for real or not, from a naive user's >> perspective it sure seems like it should be possible >> to solve this problem. It basically seems like what svn >> or other version control systems already do. They >> remember changes (and for the case of text files, >> they store only differences. For binaries it should >> also be possible to efficiently store changes... in >> fact I seem to remember a new update feature that >> will do something like that). > > binaries are only half of the problem. > > You also have to worry about rolling back the users data. > > if I upgrade from mysql4 to mysql5, for example and get mysql5 running then > my databases have been converted. Now, if I rollback the binaries, how do I > go back? > > Mysql is obviously a big item and maybe not that common so let's look at a > more common one: > firefox > evolution > > these two seem to routinely change their config formats in incompatible > ways. > > How does a rollback solve that problem? Except in extreme circumstances (e.g. MySQL) data files are a low priority. If I'm in such dire straights to need a rollback, it's because a package, or packages, is/are dead in the water. At that point the data and/or configuration is moot. So, I either 1. Wait for a fix. 2. Rollback. Currently "2." happens manually anyway. By not having such a feature, what is yum accomplishing? jerry -- fedora-test-list mailing list fedora-test-list@xxxxxxxxxx To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-test-list
